CCSP · Question #286
Fiber-optic lines are considered part of layer __________ of the OSI model. Response:
The correct answer is A. 1. Fiber-optic lines, like other physical media, operate at Layer 1 (the Physical Layer) of the OSI model, responsible for the transmission and reception of raw bit streams.
Question
Fiber-optic lines are considered part of layer __________ of the OSI model. Response:
Options
- A1
- B3
- C5
- D7
How the community answered
(29 responses)- A90% (26)
- C3% (1)
- D7% (2)
Why each option
Fiber-optic lines, like other physical media, operate at Layer 1 (the Physical Layer) of the OSI model, responsible for the transmission and reception of raw bit streams.
The Open Systems Interconnection (OSI) model's Layer 1, the Physical Layer, defines the electrical, mechanical, procedural, and functional specifications for activating, maintaining, and deactivating the physical link between end systems. Fiber-optic lines are physical transmission media that carry raw data bits as pulses of light, making them a fundamental component of the Physical Layer.
Layer 3 (Network Layer) deals with logical addressing (IP addresses) and routing, not physical transmission media.
Layer 5 (Session Layer) establishes, manages, and terminates sessions between applications.
Layer 7 (Application Layer) provides network services to end-user applications.
Concept tested: OSI model Physical Layer
Source: https://learn.microsoft.com/en-us/training/modules/network-fundamentals/7-network-layers
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